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# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import re
from sqlalchemy.dialects.postgresql import insert
from sqlalchemy.engine import Engine
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy_cockroachdb import run_transaction
from typing import Dict, List, Optional, Tuple
from common.proto.context_pb2 import Connection, ConnectionId, ConnectionIdList, ConnectionList, ServiceId
from common.method_wrappers.ServiceExceptions import NotFoundException
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from common.tools.grpc.Tools import grpc_message_to_json_string
from common.tools.object_factory.Connection import json_connection_id
from .models.ConnectionModel import ConnectionEndPointModel, ConnectionModel, ConnectionSubServiceModel
from .uuids.Connection import connection_get_uuid
from .uuids.EndPoint import endpoint_get_uuid
from .uuids.Service import service_get_uuid
def connection_list_ids(db_engine : Engine, request : ServiceId) -> ConnectionIdList:
_,service_uuid = service_get_uuid(request, allow_random=False)
def callback(session : Session) -> List[Dict]:
obj_list : List[ConnectionModel] = session.query(ConnectionModel).filter_by(service_uuid=service_uuid).all()
#.options(selectinload(ContextModel.connection)).filter_by(context_uuid=context_uuid).one_or_none()
return [obj.dump_id() for obj in obj_list]
return ConnectionIdList(connection_ids=run_transaction(sessionmaker(bind=db_engine), callback))
def connection_list_objs(db_engine : Engine, request : ServiceId) -> ConnectionList:
_,service_uuid = service_get_uuid(request, allow_random=False)
def callback(session : Session) -> List[Dict]:
obj_list : List[ConnectionModel] = session.query(ConnectionModel).filter_by(service_uuid=service_uuid).all()
#.options(selectinload(ContextModel.connection)).filter_by(context_uuid=context_uuid).one_or_none()
return [obj.dump() for obj in obj_list]
return ConnectionList(connections=run_transaction(sessionmaker(bind=db_engine), callback))
def connection_get(db_engine : Engine, request : ConnectionId) -> Connection:
connection_uuid = connection_get_uuid(request, allow_random=False)
def callback(session : Session) -> Optional[Dict]:
obj : Optional[ConnectionModel] = session.query(ConnectionModel)\
.filter_by(connection_uuid=connection_uuid).one_or_none()
return None if obj is None else obj.dump()
obj = run_transaction(sessionmaker(bind=db_engine), callback)
if obj is None:
raise NotFoundException('Connection', request.connection_uuid.uuid, extra_details=[
'connection_uuid generated was: {:s}'.format(connection_uuid),
])
return Connection(**obj)
def connection_set(db_engine : Engine, request : Connection) -> Tuple[ConnectionId, bool]:
connection_uuid = connection_get_uuid(request.connection_id, allow_random=True)
_,service_uuid = service_get_uuid(request.service_id, allow_random=False)
settings = grpc_message_to_json_string(request.settings),
connection_data = [{
'connection_uuid': connection_uuid,
'service_uuid' : service_uuid,
'settings' : settings,
}]
connection_endpoints_data : List[Dict] = list()
for position,endpoint_id in enumerate(request.path_hops_endpoint_ids):
_, _, endpoint_uuid = endpoint_get_uuid(endpoint_id, allow_random=False)
connection_endpoints_data.append({
'connection_uuid': connection_uuid,
'endpoint_uuid' : endpoint_uuid,
'position' : position,
})
connection_subservices_data : List[Dict] = list()
for i,service_id in enumerate(request.sub_service_ids):
_, service_uuid = service_get_uuid(service_id, allow_random=False)
connection_subservices_data.append({
'connection_uuid': connection_uuid,
'subservice_uuid': service_uuid,
})
def callback(session : Session) -> None:
stmt = insert(ConnectionModel).values(connection_data)
stmt = stmt.on_conflict_do_update(
index_elements=[ConnectionModel.connection_uuid],
set_=dict(settings = stmt.excluded.settings)
)
session.execute(stmt)
if len(connection_endpoints_data) > 0:
stmt = insert(ConnectionEndPointModel).values(connection_endpoints_data)
stmt = stmt.on_conflict_do_nothing(
index_elements=[ConnectionEndPointModel.connection_uuid, ConnectionEndPointModel.endpoint_uuid]
)
try:
session.execute(stmt)
except IntegrityError as e:
str_args = ''.join(e.args).replace('\n', ' ')
pattern_fkv = \
r'\(psycopg2.errors.ForeignKeyViolation\) '\
r'insert on table \"([^\"]+)\" violates foreign key constraint '\
r'.+DETAIL\: Key \([^\)]+\)\=\([\'\"]*([^\)\'\"]+)[\'\"]*\) is not present in table \"([^\"]+)\"'
m_fkv = re.match(pattern_fkv, str_args)
if m_fkv is not None:
insert_table, primary_key, origin_table = m_fkv.groups()
raise NotFoundException(origin_table, primary_key, extra_details=[
'while inserting in table "{:s}"'.format(insert_table)
]) from e
else:
raise
if len(connection_subservices_data) > 0:
stmt = insert(ConnectionSubServiceModel).values(connection_subservices_data)
stmt = stmt.on_conflict_do_nothing(
index_elements=[ConnectionSubServiceModel.connection_uuid, ConnectionSubServiceModel.subservice_uuid]
)
session.execute(stmt)
run_transaction(sessionmaker(bind=db_engine), callback)
updated = False # TODO: improve and check if created/updated
return ConnectionId(**json_connection_id(connection_uuid)),updated
def connection_delete(db_engine : Engine, request : ConnectionId) -> bool:
connection_uuid = connection_get_uuid(request, allow_random=False)
def callback(session : Session) -> bool:
num_deleted = session.query(ConnectionModel).filter_by(connection_uuid=connection_uuid).delete()
return num_deleted > 0
return run_transaction(sessionmaker(bind=db_engine), callback)